Method for transmitting control information and a device therefor

ABSTRACT

The present invention relates to a wireless communication system. More specifically, the present invention relates to a method for transmitting uplink control information and to a device therefor, and relates to a method comprising the steps of: selecting one uplink control channel resource corresponding to a plurality of HARQ-ACKs, from a plurality of uplink control channel resources; and transmitting a bit value corresponding to the plurality of HARQ-ACKs, by using the selected uplink control channel resource. The present invention also relates to a device for the method.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.14/961,399, filed on Dec. 7, 2015, now U.S. Pat. No. 9,736,826, which isa continuation of Ser. No. 14/691,897, filed on Apr. 21, 2015, now U.S.Pat. No. 9,247,536, which is a continuation of U.S. patent applicationSer. No. 13/884,566, filed on May 9, 2013, now U.S. Pat. No. 9,042,327,which is the National Stage filing under 35 U.S.C. 371 of InternationalApplication No. PCT/KR2011/008835, filed on Nov. 18, 2011, which claimsthe benefit of U.S. Provisional Application No. 61/415,304, filed onNov. 18, 2010, U.S. Provisional Application No. 61/434,404, filed onJan. 19, 2011, and U.S. Provisional Application No. 61/435,170, filed onJan. 21, 2011, the contents of which are all hereby incorporated byreference herein in their entirety.

TECHNICAL FIELD

The present invention relates to a wireless communication system, andmore particularly, to a method for transmitting control information anda device for the same.

BACKGROUND ART

Wireless communication systems have been widely deployed to providevarious types of communication services including voice and dataservices. In general, a wireless communication system is a multipleaccess system that supports communication among multiple users bysharing available system resources (e.g. bandwidth, transmit power,etc.) among the multiple users. The multiple access system may adopt amultiple access scheme such as Code Division Multiple Access (CDMA),Frequency Division Multiple Access (FDMA), Time Division Multiple Access(TDMA), Orthogonal Frequency Division Multiple Access (OFDMA), or SingleCarrier Frequency Division Multiple Access (SC-FDMA).

DISCLOSURE Technical Problem

An object of the present invention devised to solve the problem lies ina method for transmitting uplink control information and a device forthe same in a wireless communication system. Another object of thepresent invention is to provide a method for efficiently transmittingcontrol information, preferably, ACK/NACK information in a multicarriersituation and a device for the same.

It will be appreciated by persons skilled in the art that the objectsthat could be achieved with the present invention are not limited towhat has been particularly described hereinabove and the above and otherobjects that the present invention can achieve will be more clearlyunderstood from the following detailed description taken in conjunctionwith the accompanying drawings.

Technical Solution

The object of the present invention can be achieved by providing amethod for transmitting uplink control information when a plurality ofserving cells including a primary cell and a secondary cell areconfigured in a wireless communication system, the method including:receiving information indicating some of PUCCH (Physical Uplink ControlChannel) format 1b resources of a first set configured by a higher layerthrough an SPS (Semi-Persistent Scheduling) activation PDCCH (PhysicalDownlink Control Channel); receiving an SPS PDSCH (Physical DownlinkShared Channel) without a corresponding PDCCH in the primary cell afterreceiving the SPS PDCCH; generating a plurality of HARQ-ACKs (HybridAutomatic Repeat request-Acknowledgements) including reception responseinformation corresponding to a transport block of the SPS PDSCH;selecting a PDCCH format 1b resource corresponding to the plurality ofHARQ-ACKs from PUCCH format 1b resources of a second set including oneor more PUCCH format 1b resources obtained on the basis of theindication information; and transmitting a bit value corresponding tothe plurality of HARQ-ACKs using the selected PUCCH format 1b resource,wherein one PUCCH format 1b resource is provided on the basis of theindication information when the primary cell is set to a transmissionmode supporting a transmission of only a single transport block and aplurality of PUCCH format 1b resources is provided on the basis of theindication information when the primary cell is set to a transmissionmode supporting transmission of a plurality of transport blocks.

In another aspect of the present invention, provided herein is acommunication device configured to transmit uplink control informationwhen a plurality of serving cells including a primary cell and asecondary cell are configured in a wireless communication system, thecommunication device including: an RF (Radio Frequency) unit; and aprocessor, wherein the processor is configured to receive informationindicating some of PUCCH format 1b resources of a first set configuredby a higher layer through an SPS activation PDCCH, to receive an SPSPDSCH without a corresponding PDCCH in the primary cell after receivingthe SPS PDCCH, to generate a plurality of HARQ-ACKs including receptionresponse information corresponding to a transport block of the SPSPDSCH, to select a PDCCH format 1b resource corresponding to theplurality of HARQ-ACKs from PUCCH format 1b resources of a second setincluding one or more PUCCH format 1b resources obtained on the basis ofthe indication information, and to transmit a bit value corresponding tothe plurality of HARQ-ACKs using the selected PUCCH format 1b resource,wherein one PUCCH format 1b resource is provided on the basis of theindication information when the primary cell is set to a transmissionmode supporting a transmission of only a single transport block and aplurality of PUCCH format 1b resources is provided on the basis of theindication information when the primary cell is set to a transmissionmode supporting transmission of a plurality of transport blocks.

The indication information may indicate a single value, wherein onePUCCH format 1b resource is provided on the basis of the single valuewhen the primary cell is set to a transmission mode supporting atransmission of only a single transport block and a pair of PUCCH format1b resources is provided on the basis of the single value when theprimary cell is set to a transmission mode supporting transmission of aplurality of transport blocks.

The relationship among the plurality of HARQ-ACKs, the PUCCH format 1bresources of the second set and the bit value may include therelationship shown in Table 1

TABLE 1 HARQ- HARQ- HARQ- ACK(0) ACK(1) ACK(2) n⁽¹⁾ _(PUCCH, i) b(0)b(1)ACK ACK ACK n⁽¹⁾ _(PUCCH, 1) 1, 1 ACK NACK/DTX ACK n⁽¹⁾ _(PUCCH, 1) 1, 0NACK/DTX ACK ACK n⁽¹⁾ _(PUCCH, 1) 0, 1 NACK/DTX NACK/DTX ACK n⁽¹⁾_(PUCCH, 2) 1, 1 ACK ACK NACK/DTX n⁽¹⁾ _(PUCCH, 0) 1, 1 ACK NACK/DTXNACK/DTX n⁽¹⁾ _(PUCCH, 0) 1, 0 NACK/DTX ACK NACK/DTX n⁽¹⁾ _(PUCCH, 0) 0,1 NACK/DTX NACK/DTX NACK n⁽¹⁾ _(PUCCH, 2) 0, 0 NACK NACK/DTX DTX n⁽¹⁾_(PUCCH, 0) 0, 0 NACK/DTX NACK DTX n⁽¹⁾ _(PUCCH, 0) 0, 0 DTX DTX DTX NoTransmissionwherein HARQ-ACK(0) and HARQ-ACK(1) represent ACK/NACK/DTX(Acknowledgement/Negative ACK/Discontinuous Transmission) responses totransport blocks of a serving cell set to a transmission mode supportingtransmission of 2 transport blocks, HARQ-ACK(2) represents anACK/NACK/DTX response to a transport block of a serving cell set to atransmission mode supporting transmission of a single transport block,n_(PUCCH,i) ⁽¹⁾, (i=0, 1, 2) denotes the PUCCH format 1b resources ofthe second set, and b(0)b(1) denotes the bit value, wherein n_(PUCCH,i)⁽¹⁾(i=2) is provided on the basis of the indication information when theprimary cell is set to a transmission mode supporting a transmission ofonly a single transport block and n_(PUCCH,i) ⁽¹⁾ (i=0, 1) is providedon the basis of the indication information when the primary cell is setto a transmission mode supporting transmission of a plurality oftransport blocks.

The relationship among the plurality of HARQ-ACKs, the PUCCH format 1bresources of the second set and the bit value may include therelationship shown in Table 2

TABLE 2 HARQ- HARQ- HARQ- HARQ- ACK(0) ACK(1) ACK(2) ACK(3) n⁽¹⁾_(PUCCH, i) b(0)b(1) ACK ACK ACK ACK n⁽¹⁾ _(PUCCH, 1) 1, 1 ACK NACK/DTXACK ACK n⁽¹⁾ _(PUCCH, 2) 0, 1 NACK/DTX ACK ACK ACK n⁽¹⁾ _(PUCCH, 1) 0, 1NACK/DTX NACK/DTX ACK ACK n⁽¹⁾ _(PUCCH, 3) 1, 1 ACK ACK ACK NACK/DTXn⁽¹⁾ _(PUCCH, 1) 1, 0 ACK NACK/DTX ACK NACK/DTX n⁽¹⁾ _(PUCCH, 2) 0, 0NACK/DTX ACK ACK NACK/DTX n⁽¹⁾ _(PUCCH, 1) 0, 0 NACK/DTX NACK/DTX ACKNACK/DTX n⁽¹⁾ _(PUCCH, 3) 1, 0 ACK ACK NACK/DTX ACK n⁽¹⁾ _(PUCCH, 2) 1,1 ACK NACK/DTX NACK/DTX ACK n⁽¹⁾ _(PUCCH, 2) 1, 0 NACK/DTX ACK NACK/DTXACK n⁽¹⁾ _(PUCCH, 3) 0, 1 NACK/DTX NACK/DTX NACK/DTX ACK n⁽¹⁾_(PUCCH, 3) 0, 0 ACK ACK NACK/DTX NACK/DTX n⁽¹⁾ _(PUCCH, 0) 1, 1 ACKNACK/DTX NACK/DTX NACK/DTX n⁽¹⁾ _(PUCCH, 0) 1, 0 NACK/DTX ACK NACK/DTXNACK/DTX n⁽¹⁾ _(PUCCH, 0) 0, 1 NACK/DTX NACK NACK/DTX NACK/DTX n⁽¹⁾_(PUCCH, 0) 0, 0 NACK NACK/DTX NACK/DTX NACK/DTX n⁽¹⁾ _(PUCCH, 0) 0, 0DTX DTX NACK/DTX NACK/DTX No TransmissionWherein HARQ-ACK(0) and HARQ-ACK(1) represent ACK/NACK/DTX responses totransport blocks of the primary cell, HARQ-ACK(2) and HARQ-ACK(3)represent ACK/NACK/DTX responses to transport blocks of the secondarycell, n_(PUCCH,i) ⁽¹⁾ (i=0, 1, 2, 3) denotes the PUCCH format 1bresources of the second set, and b(0)b(1) denotes the bit value, whereinn_(PUCCH,i) ⁽¹⁾ (i=0, 1) is provided on the basis of the indicationinformation.

n_(PUCCH,i) ⁽¹⁾ (i=2, 3) may be provided using a lowest CCE index andthe next CCE index of CCEs constructing a PDCCH corresponding totransport blocks of the secondary cell when the PDCCH corresponding tothe transport blocks of the secondary cell is received in the primarycell, and n_(PUCCH,i) ⁽¹⁾ (i=2, 3) may be provided using PUCCH format 1bresource indexes of a third set configured by an RRC (Radio ResourceControl) layer when the PDCCH corresponding to the transport blocks ofthe secondary cell is received in the secondary cell.

The indication information may be received through a TPC (Transmit PowerControl) field of the SPS activation PDCCH.

Advantageous Effects

According to the present invention, uplink control information can beefficiently transmitted in a wireless communication system. Furthermore,control information, preferably, ACK/NACK information can be efficientlytransmitted in a multicarrier situation.

The effects of the present invention are not limited to theabove-described effects and other effects which are not described hereinwill become apparent to those skilled in the art from the followingdescription.

DESCRIPTION OF DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the invention, illustrate embodiments of the inventionand together with the description serve to explain the principle of theinvention.

In the drawings:

FIG. 1 illustrates a radio frame structure;

FIG. 2 illustrates a resource grid of a downlink slot;

FIG. 3 illustrates a downlink subframe structure;

FIG. 4 illustrates an uplink subframe structure;

FIG. 5 illustrates a slot level structure of PUCCH format 1a/1b;

FIG. 6 illustrates an example of determining a dynamic PUCCH resourcefor ACK/NACK;

FIG. 7 illustrates a carrier aggregation (CA) communication system;

FIG. 8 illustrates scheduling in case of aggregation of a plurality ofcarriers;

FIGS. 9 and 10 illustrate an ACK/NACK channel selection scheme accordingto an embodiment of the present invention; and

FIG. 11 illustrates a base station (BS) and a user equipment (UE)applicable to an embodiment of the present invention.

BEST MODE

Embodiments of the present invention are applicable to a variety ofwireless access technologies such as Code Division Multiple Access(CDMA), Frequency Division Multiple Access (FDMA), Time DivisionMultiple Access (TDMA), Orthogonal Frequency Division Multiple Access(OFDMA), and Single Carrier Frequency Division Multiple Access(SC-FDMA). CDMA can be implemented as a radio technology such asUniversal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA can beimplemented as a radio technology such as Global System for Mobilecommunications (GSM)/General Packet Radio Service (GPRS)/Enhanced DataRates for GSM Evolution (EDGE). OFDMA can be implemented as a radiotechnology such as Institute of Electrical and Electronics Engineers(IEEE) 802.11 (Wireless Fidelity (Wi-Fi)), IEEE 802.16 (Worldwideinteroperability for Microwave Access (WiMAX)), IEEE 802.20, EvolvedUTRA (E-UTRA). UTRA is a part of Universal Mobile TelecommunicationsSystem (UMTS). 3^(rd) Generation Partnership Project (3GPP) Long TermEvolution (LTE) is a part of Evolved UMTS (E-UMTS) using E-UTRA,employing OFDMA for downlink and SC-FDMA for uplink. LTE-Advanced(LTE-A) is an evolution of 3GPP LTE.

While the following description is given, centering on 3GPP LTE/LTE-A toclarify the description, this is purely exemplary and thus should not beconstrued as limiting the present invention.

FIG. 1 illustrates a radio frame structure.

Referring to FIG. 1, a radio frame includes 10 subframes. A subframeincludes two slots in time domain. A time for transmitting one subframeis defined as a transmission time interval (TTI). For example, onesubframe may have a length of 1 millisecond (ms), and one slot may havea length of 0.5 ms. One slot includes a plurality of orthogonalfrequency division multiplexing (OFDM) or single carrier frequencydivision multiple access (SC-FDMA) symbols in time domain. Since LTEuses the OFDMA in the downlink and uses SC-FDMA in the uplink, an OFDMor SC-FDMA symbol represents one symbol period. A resource block (RB) isa resource allocation unit, and includes a plurality of contiguoussubcarriers in one slot. The structure of the radio frame is shown forexemplary purposes only. Thus, the number of subframes included in theradio frame or the number of slots included in the subframe or thenumber of OFDM symbols included in the slot may be modified in variousmanners.

FIG. 2 illustrates a resource grid of a downlink slot.

Referring to FIG. 2, a downlink slot includes a plurality of OFDMsymbols in the time domain. One downlink slot may include 7(6) OFDMsymbols, and one resource block (RB) may include 12 subcarriers in thefrequency domain. Each element on the resource grid is referred to as aresource element (RE). One RB includes 12×7(6) REs. The number N_(RB) ofRBs included in the downlink slot depends on a downlink transmitbandwidth. The structure of an uplink slot may be same as that of thedownlink slot except that OFDM symbols by replaced by SC-FDMA symbols.

FIG. 3 illustrates a downlink subframe structure.

Referring to FIG. 3, a maximum of three (four) OFDM symbols located in afront portion of a first slot within a subframe correspond to a controlregion to which a control channel is allocated. The remaining OFDMsymbols correspond to a data region to which a physical downlink sharedchancel (PDSCH) is allocated. A PDSCH is used to carry a transport block(TB) or a codeword (CW) corresponding to the TB. The TB means a datablock transmitted from a MAC layer to a PHY layer through a transportchannel. The codeword corresponds to a coded version of a TB. Thecorresponding relationship between the TB and the CW depends on swiping.In the specifically, the PDSCH, TB and CW are interchangeably used.Examples of downlink control channels used in LTE include a physicalcontrol format indicator channel (PCFICH), a physical downlink controlchannel (PDCCH), a physical hybrid ARQ indicator channel (PHICH), etc.The PCFICH is transmitted at a first OFDM symbol of a subframe andcarries information regarding the number of OFDM symbols used fortransmission of control channels within the subframe. The PHICH is aresponse of uplink transmission and carries an HARQ acknowledgment(ACK)/not-acknowledgment (NACK) signal.

Control information transmitted through the PDCCH is referred to asdownlink control information (DCI). The DCI includes resource allocationinformation for a UE or a UE group and other control information. Forexample, the DCI includes uplink/downlink scheduling information, anuplink transmit (Tx) power control command, etc. Transmission modes andinformation content of DCI formats for configuring a multi-antennatechnology are as follows.

Transmission Mode

-   -   Transmission mode 1: Transmission from a single base station        antenna port    -   Transmission mode 2: Transmit diversity    -   Transmission mode 3: Open-loop spatial multiplexing    -   Transmission mode 4: Closed-loop spatial multiplexing    -   Transmission mode 5: Multi-user MIMO    -   Transmission mode 6: Closed-loop rank-1 precoding    -   Transmission mode 7: Transmission using UE-specific reference        signals

DCI Format

-   -   Format 0: Resource grants for the PUSCH transmissions (uplink)    -   Format 1: Resource assignments for single codeword PDSCH        transmissions (transmission modes 1, 2 and 7)    -   Format 1A: Compact signaling of resource assignments for single        codeword PDSCH (all modes)    -   Format 1B: Compact resource assignments for PDSCH using rank-1        closed loop precoding (mod 6)    -   Format 1C: Very compact resource assignments for PDSCH (e.g.        paging/broadcast system information)    -   Format 1D: Compact resource assignments for PDSCH using        multi-user MIMO (mode 5)    -   Format 2: Resource assignments for PDSCH for closed-loop MIMO        operation (mode 4)    -   Format 2A: Resource assignments for PDSCH for open-loop MIMO        operation (mode 3)    -   Format 3/3A: Power control commands for PUCCH and PUSCH with        2-bit/1-bit power adjustments

As described above, the PDCCH may carry a transport format and aresource allocation of a downlink shared channel (DL-SCH), resourceallocation information of an uplink shared channel (UL-SCH), paginginformation on a paging channel (PCH), system information on the DL-SCH,information on resource allocation of an upper-layer control messagesuch as a random access response transmitted on the PDSCH, a set of Txpower control commands on individual UEs within an arbitrary UE group, aTx power control command, information on activation of a voice over IP(VoIP), etc. A plurality of PDCCHs can be transmitted within a controlregion. The UE can monitor the plurality of PDCCHs. The PDCCH istransmitted on an aggregation of one or several consecutive controlchannel elements (CCEs). The CCE is a logical allocation unit used toprovide the PDCCH with a coding rate based on a state of a radiochannel. The CCE corresponds to a plurality of resource element groups(REGs). A format of the PDCCH and the number of bits of the availablePDCCH are determined by the number of CCEs. The BS determines a PDCCHformat according to DCI to be transmitted to the UE, and attaches acyclic redundancy check (CRC) to control information. The CRC is maskedwith a unique identifier (referred to as a radio network temporaryidentifier (RNTI)) according to an owner or usage of the PDCCH. If thePDCCH is for a specific UE, a unique identifier (e.g., cell-RNTI(C-RNTI)) of the UE may be masked to the CRC. Alternatively, if thePDCCH is for a paging message, a paging identifier (e.g., paging-RNTI(P-RNTI)) may be masked to the CRC. If the PDCCH is for systeminformation (more specifically, a system information block (SIB)), asystem information RNTI (SI-RNTI) may be masked to the CRC. When thePDCCH is for a random access response, a random access-RNTI (RA-RNTI)may be masked to the CRC.

FIG. 4 illustrates an uplink subframe structure.

Referring to FIG. 4, an uplink subframe includes a plurality of (e.g. 2)slots. A slot may include different numbers of SC-FDMA symbols accordingto CP lengths. The uplink subframe is divided into a control region anda data region in the frequency domain. The data region is allocated witha PUSCH and used to carry a data signal such as audio data. The controlregion is allocated a PUCCH and used to carry uplink control information(UCI). The PUCCH includes an RB pair located at both ends of the dataregion in the frequency domain and hopped in a slot boundary.

The PUCCH can be used to transmit the following control information.

-   -   Scheduling Request (SR): This is information used to request a        UL-SCH resource and is transmitted using On-Off Keying (OOK)        scheme.    -   HARQ ACK/NACK: This is a response signal to a downlink data        packet on a PDSCH and indicates whether the downlink data packet        has been successfully received. A 1-bit ACK/NACK signal is        transmitted as a response to a single downlink codeword and a        2-bit ACK/NACK signal is transmitted as a response to two        downlink codewords.    -   Channel Quality Indicator (CQI): This is feedback information        about a downlink channel. Feedback information regarding        Multiple Input Multiple Output (MIMO) includes Rank Indicator        (RI) and Precoding Matrix Indicator (PMI). 20 bits are used for        each subframe.

The quantity of control information (UCI) that a UE can transmit througha subframe depends on the number of SC-FDMA symbols available forcontrol information transmission. The SC-FDMA symbols available forcontrol information transmission correspond to SC-FDMA symbols otherthan SC-FDMA symbols of the subframe, which are used for referencesignal transmission. In the case of a subframe in which a SoundingReference Signal (SRS) is configured, the last SC-FDMA symbol of thesubframe is excluded from the SC-FDMA symbols available for controlinformation transmission. A reference signal is used to detect coherenceof the PUCCH. The PUCCH supports 7 formats according to informationtransmitted thereon.

Table 1 shows the mapping relationship between PUCCH formats and UCI inLTE.

TABLE 1 PUCCH format UCI (Uplink Control Information) Format 1 SR(Scheduling Request) (non-modulated waveform Format 1a 1-bit HARQACK/NACK (SR exist/non-exist) Format 1b 2-bit HARQ ACK/NACK (SRexist/non-exist) Format 2 CQI (20 coded bits) Format 2 CQI and 1- or2-bit HARQ ACK/NACK (20 bits) (corresponding to only extended CP) Format2a CQI and 1-bit HARQ ACK/NACK (20 + 1 coded bits) Format 2b CQI and2-bit HARQ ACK/NACK (20 + 2 coded bits)

FIG. 5 illustrates a slot level structure of PUCCH formats 1a/1b. ThePUCCH formats 1a/1b are used for ACK/NACK transmission. In the case ofnormal CP, SC-FDMA symbols #2, #3 and #4 are used for DM RStransmission. In the case of extended CP, SC-FDMA symbols #2 and #3 areused for DM RS transmission. Accordingly, 4 SC-FDMA symbols in a slotare used for ACK/NACK transmission. PUCCH format 1a/1b is called PUCCHformat 1 for convenience.

Referring to FIG. 5, 1-bit [b(0)] and 2-bit [b(0)b(1)] ACK/NACKinformation are modulated according to BPSK and QPSK modulation schemesrespectively, to generate one ACK/NACK modulation symbol d₀. Each bit[b(i), i=0, 1] of the ACK/NACK information indicates a HARQ response toa corresponding DL transport block, corresponds to 1 in the case ofpositive ACK and corresponds to 0 in case of negative ACK (NACK). Table2 shows a modulation table defined for PUCCH formats 1a and 1b in LTE.

TABLE 2 PUCCH format b(0), . . . , b(M_(bit) − 1) d(0) 1a 0  1 1 −1 1b00  1 01 −j 10  j 11 −1

PUCCH formats 1a/1b perform time domain spreading using an orthogonalspreading code W₀, W₁, W₂, W₃, (e.g. Walsh-Hadamard or DFT code) inaddition to cyclic shift α_(cs,x) in the frequency domain. In the caseof PUCCH formats 1a/1b, a larger number of UEs can be multiplexed on thesame PUCCH RB because code multiplexing is used in both frequency andtime domains.

RSs transmitted from different UEs are multiplexed using the same methodas is used to multiplex UCI. The number of cyclic shifts supported bySC-FDMA symbols for PUCCH ACK/NACK RB can be configured by cell-specifichigher layer signaling parameter Δ_(shift) ^(PUCCH). Δ_(shift)^(PUCCH)ϵ{1, 2, 3} represents that shift values are 12, 6 and 4,respectively. In time-domain CDM, the number of spreading codes actuallyused for ACK/NACK can be limited by the number of RS symbols becausemultiplexing capacity of RS symbols is less than that of UCI symbols dueto a smaller number of RS symbols.

FIG. 6 illustrates an example of determining PUCCH resources forACK/NACK. In LTE, a plurality of PUCCH resources for ACK/NACK are sharedby a plurality of UEs in a cell every time the UEs need the PUCCHresources rather than allocated to UEs in advance.

Specifically, a PUCCH resource used by a UE to transmit an ACK/NACKsignal corresponds to a PDCCH on which scheduling information on DL datainvolving the ACK/NACK signal is delivered. The region in which thePDCCH is transmitted in a DL subframe is configured with a plurality ofControl Channel Elements (CCEs), and the PDCCH transmitted to the UE iscomposed of one or more CCEs. The UE transmits the ACK/NACK signalthrough a PUCCH resource corresponding to a specific one (e.g. firstCCE) of the CCEs constituting the received PDCCH.

Referring to FIG. 6, each block in a Downlink Component Carrier (DL CC)represents a CCE and each block in an Uplink Component Carrier (UL CC)indicates a PUCCH resource. Each PUCCH index corresponds to a PUCCHresource for an ACK/NACK signal. If information on a PDSCH is deliveredon a PDCCH composed of CCEs #4, #5 and #6, as shown in FIG. 8, a UEtransmits an ACK/NACK signal on PUCCH #4 corresponding to CCE #4, thefirst CCE of the PDCCH. FIG. 8 illustrates a case in which maximum MPUCCHs are present in the UL CC when maximum N CCEs exist in the DL CC.Though N can equal M, N may differ from M and CCEs are mapped to PUCCHsin an overlapped manner.

Specifically, a PUCCH resource index in LTE is determined as follows.n ⁽¹⁾ _(PUCCH) =n _(CCE) +N ⁽¹⁾ _(PUCCH)  [Equation 1]Here, n⁽¹⁾ _(PUCCH) represents a resource index of PUCCH format 1 forACK/NACK/DTX transmission, N⁽¹⁾ _(PUCCH) denotes a signaling valuereceived from a higher layer, and n_(CCE) denotes the smallest value ofCCE indexes used for PDCCH transmission. A cyclic shift, an orthogonalspreading code and a Physical Resource Block (PRB) for PUCCH formats1a/1b are obtained from n⁽¹⁾ _(PUCCH).

A description will be given of SPS (Semi-Persistent Scheduling) and amethod for semi-statically allocating a PUCCH resource for ACK/NACKduring SPS.

Unicast data is dynamically allocated a resource according to schedulingfor each subframe. SPS reserves a resource for traffic periodicallygenerated having a middle/low data rate, such as VoIP (Voice overInternet Protocol) or streaming. SPS can reduce scheduling overhead andstably allocate resources by reserving a resource for specific traffic.

In case of DL/UL SPS in LTE, information about a subframe through whichSPS transmission (Tx)/reception (Rx) needs to be performed is providedthrough RRC (Radio Resource Control) signaling and activation,reactivation and release of SPS are performed through a PDCCH. Subframeinformation for SPS includes a subframe interface and a subframe offset.For convenience, a PDCCH for activation/reactivation/release of SPS iscalled an SPS PDCCH. The SPS PDCCH carries RB allocation information forSPS Tx/Rx and MCS (Modulation and Coding Scheme) information. The SPSPDCCH has a CRC (Cyclic Redundancy Check) masked with an SPS C-RNTI(Cell Radio Network Temporary Identifier) and NDI is set as NDI=0.Accordingly, a UE does not directly perform SPS Tx/Rx even whenallocated information about a subframe for which SPS needs to beperformed through RRC signaling. When the UE receives the SPS PDCCH thatsignals SPS activation (or reactivation), the UE performs SPS Tx (e.g.PUSCH transmission) or SPS Rx (e.g. PDSCH reception) in a subframeallocated through RRC signaling. SPS Tx/Rx is performed in thecorresponding subframe using RB allocation information and MCSinformation included in the SPS PDCCH. Upon reception of a PDCCH thatsignals SPS release, the UE interrupts SPS Tx/Rx. When an SPS PDCCH thatsignals activation (or reactivation) is received, the interrupted SPSTx/Rx is resumed using RB allocation and an MCS indicated by the SPSPDCCH in a subframe allocated through RRC signaling.

In case of SPS activation, DCI fields of the SPS PDCCH are set as shownin Table 3. A field combination shown in FIG. 3 is used as a virtual CRCfor SPS activation PDCCH validation.

TABLE 3 DCI DCI format DCI format format 0 1/1A 2/2A/2B TPC command forset to N/A N/A scheduled PUSCH ‘00’ Cyclic shift DM RS set to N/A N/A‘000’ Modulation and MSB N/A N/A coding scheme and is set redundancyversion to ‘0’ HARQ process N/A FDD: set to ‘000’ FDD: set to ‘000’number TDD: set to TDD: set to ‘0000’ ‘0000’ Modulation and N/A MSB isset to ‘0’ For the enabled coding scheme transport block: MSB is set to‘0’ Redundancy version N/A set to ‘00’ For the enabled transport block:set to ‘00’

The virtual CRC is used to additionally detect an error by checkingwhether a corresponding field value is an appointed value. If a UE doesnot detect an error although the error is generated in a DCI allocatedto the UE and misrecognizes the DCI as SPS activation, the one-timeerror continuously generate problems because the UE continuously usesthe corresponding resource. Accordingly, incorrect detection of SPS isprevented using the virtual CRC.

In case of SRS release, DCI fields of the SPS PDCCH are set as shown inTable 4. A field combination shown in FIG. 4 is used as a virtual CRCfor SPS release PDCCH validation. In case of SPS release, the UEtransmits ACK/NACK for the SPS release PDCCH.

TABLE 4 DCI format 0 DCI format 1A TPC command for scheduled set to ‘00’N/A PUSCH Cyclic shift DM RS set to ‘000’ N/A Modulation and codingscheme and set to ‘11111’ N/A redundancy version Resource blockassignment and Set to all ‘1’s N/A hopping resource allocation HARQprocess number N/A FDD: set to ‘000’ TDD: set to ‘0000’ Modulation andcoding scheme N/A set to ‘11111’ Redundancy version N/A set to ‘00’Resource block assignment N/A Set to all ‘1’s

A detailed description will be given of uplink SPS. The BS signals asubframe (e.g. an interval of 20 ms) for which SPS needs to be performedto the UE through higher layer (e.g. RRC) signaling. Then, the BS cantransmit an SPS PDCCH signaling SPS activation to the UE. The SPS PDCCHincludes UL grant information. In this case, the UE is allocated aspecific RB and MCS designated by the SPS PDCCH at an interval of 20 msfor uplink transmission after reception of a UL grant message throughSPS signaling. Accordingly, the UE can perform uplink transmission usingthe RB and MCS designated by the SPS PDCCH at an interval of 20 ms.There is no PDCCH corresponding to a PUSCH signal transmitted duringSPS. For convenience, a PUSCH according to SPS is called an SPS PUSCH.Downlink SPS is performed similarly. Specifically, upon reception of anSPS activation PDCCH having a DL grant, the UE can receive a downlinksignal (e.g. PDSCH) using an RB and MCS designated by the SPS PDCCH atan interval of 20 ms. There is no PDCCH corresponding to a PDSCH signaltransmitted during SPS. For convenience, a PDSCH according to SPS iscalled an SPS PDSCH. In case of the SPS PDSCH, a PDCCH correspondingthereto is not present. In this sense, the SPS PDSCH can be referred toas a PDSCH without a PDCCH. Accordingly, it is impossible to allocate aPUCCH resource for ACK/NACK transmission using CCEs constructing aPDCCH, as described above with reference to FIG. 6 and Equation 1. Tosolve this, LTE configures a PUCCH resource candidate set for ACK/NACKtransmission for the SPS PDSCH through higher layer signaling andexplicitly indicates one PUCCH resource included in the PUCCH resourcecandidate set through the SPS activation PDCCH. A value indicating thePUCCH resource can be transmitted through a TPC (Transmit Power Control)field of the SPS activation PDCCH.

Table 5 shows PUCCH resource indexes for downlink SPS defined in LTE.Referring to Table 5, 4 PUCCH resource indexes are configured by ahigher layer and one PUCCH resource index can be indicated through theTPC field (TPC command) of the SPS activation PDCCH.

TABLE 5 Value of ‘TPC command for PUCCH’ n⁽¹⁾ _(PUCCH) 00 First PUCCHresource index configured by a higher layer 01 Second PUCCH resourceindex configured by a higher layer 10 Third PUCCH resource indexconfigured by a higher layer 11 Fourth PUCCH resource index configuredby a higher layer

A description will be given of an ACK/NACK channel selection scheme(simply, A/N channel selection scheme or channel selection scheme). Whenan LTE system operates in TDD, the UE transmits one multiplexed ACK/NACKsignal for a plurality of PDSCHs received through different subframes.Specifically, the UE transmits one multiplexed ACK/NACK signal for aplurality of PDSCHs using the A/N channel selection scheme. A/N channelselection is also called a PUCCH selection transmission scheme. In theA/N channel selection scheme, the UE occupies a plurality of uplinkphysical channels in order to transmit a multiplexed ACK/NACK signalupon receiving a plurality of downlink data. For example, when the UEreceives a plurality of PDSCHs, the UE can occupy as many PUCCHresources as the number of the PDSCHs using a specific CCE indicatingeach PDSCH. In this case, the UE can transmit a multiplexed ACK/NACKsignal using a combination of information about a PUCCH resourceselected from the occupied PUCCH resources and information aboutmodulation/coding applied to the selected PUCCH resource.

Table 6 shows an A/N channel selection scheme defined in LTE.

TABLE 6 HARQ-ACK(0), HARQ-ACK(1), Subframe HARQ-ACK(2), HARQ-ACK(3) n⁽¹⁾_(PUCCH, i) b(0), b(1) ACK, ACK, ACK, ACK n⁽¹⁾ _(PUCCH, 1) 1, 1 ACK,ACK, ACK, NACK/DTX n⁽¹⁾ _(PUCCH, 1) 1, 0 NACK/DTX, NACK/DTX, NACK, DTXn⁽¹⁾ _(PUCCH, 2) 1, 1 ACK, ACK, NACK/DTX, ACK n⁽¹⁾ _(PUCCH, 1) 1, 0NACK, DTX, DTX, DTX n⁽¹⁾ _(PUCCH, 0) 1, 0 ACK, ACK, NACK/DTX, NACK/DTXn⁽¹⁾ _(PUCCH, 1) 1, 0 ACK, NACK/DTX, ACK, ACK n⁽¹⁾ _(PUCCH, 3) 0, 1NACK/DTX, NACK/DTX, NACK/DTX, n⁽¹⁾ _(PUCCH, 3) 1, 1 NACK ACK, NACK/DTX,ACK, NACK/DTX n⁽¹⁾ _(PUCCH, 2) 0, 1 ACK, NACK/DTX, NACK/DTX, ACK n⁽¹⁾_(PUCCH, 0) 0, 1 ACK, NACK/DTX, NACK/DTX, NACK/ n⁽¹⁾ _(PUCCH, 0) 1, 1DTX NACK/DTX, ACK, ACK, ACK n⁽¹⁾ _(PUCCH, 3) 0, 1 NACK/DTX, NACK, DTX,DTX n⁽¹⁾ _(PUCCH, 1) 0, 0 NACK/DTX, ACK, ACK, NACK/DTX n⁽¹⁾ _(PUCCH, 2)1, 0 NACK/DTX, ACK, NACK/DTX, ACK n⁽¹⁾ _(PUCCH, 3) 1, 0 NACK/DTX, ACK,NACK/DTX, NACK/ n⁽¹⁾ _(PUCCH, 1) 0, 1 DTX NACK/DTX, NACK/DTX, ACK, ACKn⁽¹⁾ _(PUCCH, 3) 0, 1 NACK/DTX, NACK/DTX, ACK, NACK/ n⁽¹⁾ _(PUCCH, 2) 0,0 DTX NACK/DTX, NACK/DTX, NACK/DTX, n⁽¹⁾ _(PUCCH, 3) 0, 0 ACK DTX, DTX,DTX, DTX N/A N/A

In Table 6, HARQ-ACK(i) indicates the HARQ ACK/NACK/DTX result of ani-th data unit (0≤i≤3). The HARQ ACK/NACK/DTX result includes ACK, NACK,DTX and NACK/DTX. NACK/DTX represents NACK or DTX. ACK and NACKrepresent whether a TB (equivalent to a CW) transmitted through a PDSCHhas been successfully decoded or not. DTX (Discontinuous Transmission)represents that a PDCCH has not been successfully detected. Maximum 4PUCCH resources (i.e., n⁽¹⁾ _(PUCCH,0) to n⁽¹⁾ _(PUCCH,3)) can beoccupied for each data unit. The multiplexed ACK/NACK signal istransmitted through one PUCCH resource selected from the occupied PUCCHresources. In Table 3, n⁽¹⁾ _(PUCCH,X) represents a PUCCH resourceactually used for ACK/NACK transmission, and b(0)b(1) indicates two bitstransmitted through the selected PUCCH resource, which are modulatedusing QPSK. For example, when the UE has decoded 4 data unitssuccessfully, the UE transmits bits (1, 1) to a BS through a PUCCHresource linked with n⁽¹⁾ _(PUCCH,1). Since combinations of PUCCHresources and QPSK symbols cannot represent all available ACK/NACKsuppositions, NACK and DTX are coupled except in some cases (NACK/DTX,N/D).

FIG. 7 illustrates a carrier aggregation (CA) communication system. Touse a wider frequency band, an LTE-A system employs CA (or bandwidthaggregation) technology which aggregates a plurality of UL/DL frequencyblocks to obtain a wider UL/DL bandwidth. Each frequency block istransmitted using a component carrier (CC). The CC can be regarded as acarrier frequency (or center carrier, center frequency) for thefrequency block.

Referring to FIG. 7, a plurality of UL/DL CCs can be aggregated tosupport a wider UL/DL bandwidth. The CCs may be contiguous ornon-contiguous in the frequency domain. Bandwidths of the CCs can beindependently determined. Asymmetrical CA in which the number of UL CCsis different from the number of DL CCs can be implemented. For example,when there are two DL CCs and one UL CC, the DL CCs can correspond tothe UL CC in the ratio of 2:1. A DL CC/UL CC link can be fixed orsemi-statically configured in the system. Even if the system bandwidthis configured with N CCs, a frequency band that a specific UE canmonitor/receive can be limited to M (<N) CCs. Various parameters withrespect to CA can be set cell-specifically, UE-group-specifically, orUE-specifically. Control information may be transmitted/received onlythrough a specific CC. This specific CC can be referred to as a PrimaryCC (PCC) (or anchor CC) and other CCs can be referred to as SecondaryCCs (SCCs).

In LTE-A, the concept of a cell is used to manage radio resources. Acell is defined as a combination of downlink resources and uplinkresources. Yet, the uplink resources are not mandatory. Therefore, acell may be composed of downlink resources only or both downlinkresources and uplink resources. The linkage between the carrierfrequencies (or DL CCs) of downlink resources and the carrierfrequencies (or UL CCs) of uplink resources may be indicated by systeminformation. A cell operating in primary frequency resources (or a PCC)may be referred to as a primary cell (PCell) and a cell operating insecondary frequency resources (or an SCC) may be referred to as asecondary cell (SCell). The PCell is used for a UE to establish aninitial connection or re-establish a connection. The PCell may refer toa cell indicated during handover. The SCell may be configured after anRRC connection is established and may be used to provide additionalradio resources. The PCell and the SCell may collectively be referred toas a serving cell. Accordingly, a single serving cell composed of aPCell only exists for a UE in an RRC Connected state, for which CA isnot set or which does not support CA. On the other hand, one or moreserving cells exist, including a PCell and entire SCells, for a UE in anRRC CONNECTED state, for which CA is set. For CA, a network mayconfigure one or more SCells in addition to an initially configuredPCell, for a UE supporting CA during connection setup after an initialsecurity activation operation is initiated.

FIG. 8 illustrates scheduling when a plurality of carriers isaggregated. It is assumed that 3 DL CCs are aggregated and DL CC A isset to a PDCCH CC. DL CC A, DL CC B and DL CC C can be called servingCCs, serving carriers, serving cells, etc. In case of CIF disabled, a DLCC can transmit only a PDCCH that schedules a PDSCH corresponding to theDL CC without a CIF (non-cross-CC scheduling). When the CIF is enabledaccording to UE-specific (or UE-group-specific or cell-specific) higherlayer signaling, DL CC A (monitoring DL CC) can transmit not only aPDCCH that schedules the PDSCH corresponding to the DL CC A but alsoPDCCHs that schedule PDSCHs of other DL CCs (cross-CC scheduling). Inthis case, DL CC B and DL CC C that are not set to PDCCH CCs do notdeliver PDCCHs. Accordingly, the DL CC A (PDCCH CC) needs to include allof a PDCCH search space relating to the DL CC A, a PDCCH search spacerelating to the DL CC B and a PDCCH search space relating to the DL CCC.

LTE-A considers transmission of a plurality of ACK/NACKinformation/signals with respect to a plurality of PDSCHs, which aretransmitted through a plurality of DL CCs, through a specific UL CC(e.g. UL PCC or UL PCell). For description, it is assumed that a UEoperates in a SU-MIMO (Single User-Multiple Input Multiple Output) modein a certain DL CC to receive 2 codewords (or transport blocks). In thiscase, the UE needs to be able to transmit 4 feedback states, ACK/ACK,ACK/NACK, NACK/ACK and NACK/NACK, or up to 5 feedback states includingeven DTX for the DL CC. If the DL CC is set to support a single codeword(or transport block), up to 3 states of ACK, NACK and DTX are presentfor the DL CC. Accordingly, if NACK and DTX are processed as the samestate, a total of 2 feedback states of ACK and NACK/DTX are present forthe DL CC. Accordingly, if the UE aggregates a maximum of 5 DL CCs andoperates in the SU-MIMO mode in all CCs, the UE can have up to 55transmittable feedback states and an ACK/NACK payload size forrepresenting the feedback states corresponds to 12 bits. If DTX and NACKare processed as the same state, the number of feedback states is 45 andan ACK/NACK payload size for representing the same is 10 bits.

LTE-A, preferably, FDD LTE-A discusses transmission of a plurality ofACK/NACK information/signals using PUCCH format 1a/1b and ACK/NACKmultiplexing (i.e. A/N channel selection) where were used in aconventional LTE TDD system in a multicarrier situation. Theconventional LTE TDD system uses an implicit ACK/NACK selection schemeof using a PUCCH resource corresponding to each PDCCH that scheduleseach PDSCH (i.e. linked to a lowest CCE index) as an ACK/NACKmultiplexing (i.e. ACK/NACK selection) method to secure PUCCH resources.However, when the implicit ACK/NACK selection scheme is applied usingPUCCH resources in different RBs, performance deterioration may occur.Accordingly, LTE-A discusses an explicit ACK/NACK selection scheme thatreserves PUCCH resources through RRC signaling, preferably, a pluralityof PUCCH resources in the same RB or neighboring RBs, for a UE.

Table 7 shows an example of explicitly indicating a PUCCH resource forHARQ-ACK. Specifically, a PUCCH resource set can be configured by ahigher layer (e.g. RRC) and a PUCCH resource to be actually used can beindicated using an ARI (ACK/NACK Resource Indicator) value of a PDCCH.The ARI value can be indicated using a TPC (Transmit Power Control)field corresponding to a PDSCH on an SCell. The ARI value can also beindicated in different manners. The ARI value is used interchangeablywith a HARQ-ACK resource indication value.

TABLE 7 HARQ-ACK resource value (ARI) for PUCCH n_(PUCCH) 00 First PUCCHresource index configured by a higher layer 01 Second PUCCH resourceindex configured by a higher layer 10 Third PUCCH resource indexconfigured by a higher layer 11 Fourth PUCCH resource index configuredby a higher layer

A/N Channel Selection During Dynamic Scheduling

A description will be given of a method of applying an A/N channelselection scheme when multiple carriers are configured in an LTE-Asystem, preferably, FDD LTE-A system. The following description assumesdynamic scheduling. That is, it is assumed that ACK/NACK information istransmission on UL when a DL grant PDCCH and a PDSCH correspondingthereto are received. A mapping table for A/N channel selection can bedesigned under the following conditions in LTE-A.

(1) Full implicit PUCCH resource indication is supported. An implicitPUCCH resource means a PUCCH resource linked to a specific CCE (e.g.first CCE) from among one or more CCEs constructing the DL grant PDCCH(refer to Equation 1).

(2) LTE fallback is supported. LTE fallback is a scheme in which a PUCCHformat used for ACK/NACK state transmission and a modulation symboltransmitted through the PUCCH format conform to those defined in LTEwhen all serving cells (i.e. SCells) other than a PCell correspond toNACK/DTX. Mapping of ACK/NACK states and modulation symbols isdetermined based on ACK/NACK regarding the PCell.

(3) Performances of individual ACK/NACK bits are equalized by improvingworst ACK/NACK bit performance and average performance.

Table 8 shows the relationship between a TB of a serving cell andHARQ-ACK in 2-, 3- and 4-bit A/N channel selection schemes.

TABLE 8 HARQ-ACK(j) HARQ- HARQ- HARQ- HARQ- ACK(0) ACK(1) ACK(2) ACK(3)2-bit TB1 PCell TB1 SCell NA NA 3-bit TB1 Serving TB2 Serving TB1Serving NA cell#1 cell#1 cell#2 TB1 PCell TB1 SCell#1 TB1 SCell#2 NA4-bit TB1 PCell TB2 PCell TB1 SCell TB2 SCell TB1 PCell TB1 SCell#1 TB1SCell#2 TB2 SCell#2 TB1 PCell TB1 SCell#1 TB1 SCell#2 TB1 SCell#3

Table 9 shows a mapping table for 2-bit A/N channel selection. 2-bit A/Nchannel selection is based on the assumption that 2 serving cells areaggregated. Accordingly, 2-bit A/N channel selection corresponds to acase in which one non-SDM (Spatial Division Multiplexing) cell and onenon-SDM are aggregated. A non-SDM cell means a cell set to atransmission mode supporting only transmission of a maximum of one TB.An SDM cell means a cell set to a transmission mode supportingtransmission of a maximum of m (e.g. m=2) TBs. The non-SDM cell and theSDM cell are used interchangeably with a non-MIMO cell and a MIMO cell.

TABLE 9 PUCCH resource PCell SCell 0 1 ACK ACK −1 ACK NACK/DTX −1NACK/DTX ACK 1 NACK NACK/DTX 1 DTX NACK/DTX No transmission

PUCCH resource 0 can be implicitly signaled. For example, PUCCH resource0 can be linked to a CCE (e.g. lowest CCE index) constructing a DL grantPDCCH corresponding to a PDSCH of a PCell (refer to Equation 1). PUCCHresource 1 can be linked to a CCE (e.g. lowest CCE index) constructing aDL grant PDCCH corresponding to a PDSCH of an SCell (e.g. in case ofcross-CC scheduling) or explicitly signaled by RRC (e.g. in case ofnon-cross-CC scheduling).

Table 10 arranges the mapping table shown in Table 9 in a differentform.

TABLE 10 HARQ- HARQ- ACK(0) ACK(1) n⁽¹⁾ _(PUCCH, i) b(0)b(1) ACK ACKn⁽¹⁾ _(PUCCH, 1) 1, 1 ACK NACK/DTX n⁽¹⁾ _(PUCCH, 0) 1, 1 NACK/DTX ACKn⁽¹⁾ _(PUCCH, 1) 0, 0 NACK NACK/DTX n⁽¹⁾ _(PUCCH, 0) 0, 0 DTX NACK/DTXNo Transmission

In Table 10, n_(PUCCH,i) ⁽¹⁾ (i=0, 1) denotes PUCCH resource indexescorresponding to PUCCH resources 0 and 1 of Table 9 and b(0)b(1) denotesa bit value corresponding to a complex modulation value of Table 9(refer to QPSK of Table 2).

Referring to Table 10, upon reception of one or more PDSCHs from the BS,the UE generates HARQ-ACK(0) and HARQ-ACK(1) corresponding to thePDSCHs. The UE selects PUCCH resources (e.g. n_(PUCCH,i) ⁽¹⁾)corresponding to HARQ-ACK(0) and HARQ-ACK(1) and transmits acorresponding bit value (or modulation value) to the BS through theselected PUCCH resources.

Table 11 shows a mapping table for 3-bit A/N channel selection. 3-bitA/N channel selection corresponds to a case in which 2 serving cells or3 serving cells are aggregated. A case in which 2 serving cells areaggregated corresponds to a case in which one SDM cell and one non-SDMcell are aggregated. In this case, cells and TBs corresponding toHARQ-ACK(0), HARQ-ACK(1) and HARQ-ACK(2) depend on SDM configuration.Specifically, in case of SDM PCell+non-SDM SCell, HARQ-ACK(0),HARQ-ACK(1) and HARQ-ACK(2) respectively correspond to PCell TB1, PCellTB2 and SCell TB1. In case of non-SDM PCell+SDM SCell, HARQ-ACK(0),HARQ-ACK(1) and HARQ-ACK(2) respectively correspond to SCell TB1, SCellTB2 and PCell TB1. That is, HARQ-ACK(0), HARQ-ACK(1) and HARQ-ACK(2)respectively correspond to SDM cell TB1, SDM cell TB2 and non-SDM cellTB1.

TABLE 11 non- SDM Cell SDM Cell PCell SCell#1 SCell#2 HARQ- HARQ- HARQ-PUCCH resource ACK(0) ACK(1) ACK(2) 0 1 2 ACK, ACK ACK −1 ACK, NACK/DTXACK  j NACK/DTX, ACK ACK −j NACK/DTX, NACK/DTX ACK −1 ACK, ACK NACK −1 ACK, NACK/DTX NACK j NACK/DTX, ACK NACK −j  NACK/DTX, NACK/DTX NACK 1ACK, ACK DTX −1  ACK, NACK/DTX DTX j NACK/DTX, ACK DTX −j  NACK, NACKDTX 1 NACK, DTX DTX 1 DTX, NACK DTX 1 DTX, DTX DTX No transmission

When the PCell is set to an SDM mode, PUCCH resources 0 and 1 areimplicitly signaled. For example, PUCCH resources 0 and 1 can be linkedto CCEs (e.g. lowest CCE index and lowest CCE index+1) constructing a DLgrant PDCCH corresponding to a PDSCH of the PCell (refer to Equation 1).PUCCH resource 2 can be linked to a CCE (e.g. lowest CCE index)constructing a DL grant PDCCH corresponding to a PDSCH of the SCell(e.g. in case of cross-CC scheduling) or explicitly signaled by RRC(e.g. in case of non-cross-CC scheduling).

When the PCell is set to a non-SDM mode, PUCCH resource 2 can be linkedto a CCE (e.g. lowest CCE index) constructing the DL grant PDCCHcorresponding to the PDSCH of the PCell. PUCCH resources 0 and 1 can belinked to CCEs (e.g. lowest CCE index and lowest CCE index+1)constructing the DL grant PDCCH corresponding to the PDSCH of the SCell(e.g. in case of cross-CC scheduling) or explicitly signaled by RRC(e.g. in case of non-cross-CC scheduling).

To support LTE PUCCH format 1b (LTE fallback when the PCell is an SDMcell), an ACK/ACK/DTX (A/A/D) state is mapped to −1 of PUCCH resource 0and a NACK/NACK/DTX (N/N/D) state is mapped to +1 of PUCCH resource 0.Furthermore, to support PUCCH format 1a (LTE fallback when the PCell isa non-SDM cell), a DTX/DTX/ACK (D/D/A) state is mapped to −1 of PUCCHresource 2 and a DTX/DTX/NACK (D/D/N) state is mapped to +1 of PUCCHresource 2.

Table 12 arranges the mapping table shown in Table 11 in a differentform.

TABLE 12 HARQ- HARQ- HARQ- ACK(0) ACK(1) ACK(2) n⁽¹⁾ _(PUCCH, i)b(0)b(1) ACK ACK ACK n⁽¹⁾ _(PUCCH, 1) 1, 1 ACK NACK/DTX ACK n⁽¹⁾_(PUCCH, 1) 1, 0 NACK/DTX ACK ACK n⁽¹⁾ _(PUCCH, 1) 0, 1 NACK/DTXNACK/DTX ACK n⁽¹⁾ _(PUCCH, 2) 1, 1 ACK ACK NACK/DTX n⁽¹⁾ _(PUCCH, 0) 1,1 ACK NACK/DTX NACK/DTX n⁽¹⁾ _(PUCCH, 0) 1, 0 NACK/DTX ACK NACK/DTX n⁽¹⁾_(PUCCH, 0) 0, 1 NACK/DTX NACK/DTX NACK n⁽¹⁾ _(PUCCH, 2) 0, 0 NACK NACKDTX n⁽¹⁾ _(PUCCH, 0) 0, 0 NACK DTX DTX n⁽¹⁾ _(PUCCH, 0) 0, 0 DTX NACKDTX n⁽¹⁾ _(PUCCH, 0) 0, 0 DTX DTX DTX No Transmission

In Table 12, n_(PUCCH,i) ⁽¹⁾ (i=0, 1, 2) denotes PUCCH resource indexescorresponding to PUCCH resources 0, 1 and 2 of Table 11 and b(0)b(1)denotes a bit value corresponding to a complex modulation value of Table11 (refer to QPSK of Table 2).

Referring to Table 12, upon reception of one or more PDSCHs from the BS,the UE generates HARQ-ACK(0), HARQ-ACK(1) and HARQ-ACK(2) correspondingto the PDSCHs. The UE selects PUCCH resources (e.g. n_(PUCCH,i) ⁽¹⁾)corresponding to HARQ-ACK(0), HARQ-ACK(1) and HARQ-ACK(2) and transmitsa corresponding bit value (or modulation value) to the BS through theselected PUCCH resources.

Table 13 shows a mapping table for 4-bit A/N channel selection. 4-bitA/N channel selection corresponds to a case in which 2, 3 or 4 servingcells are aggregated. For example, when 2 SDM cells are aggregated,HARQ-ACK(0), HARQ-ACK(1), HARQ-ACK(2) and HARQ-ACK(3) respectivelycorrespond to PCell TB1, PCell TB2, SCell TB1 and SCell TB2.

TABLE 13 PCell SCell PCell SCell#1 SCell#2 PCell SCell#1 SCell#2 SCell#3HARQ- HARQ- HARQ- HARQ- PUCCH resource ACK(0) ACK(1) ACK(2) ACK(3) 0 1 23 ACK, ACK ACK, ACK −1 ACK, NACK/DTX ACK, ACK −j NACK/DTX, ACK ACK, ACK−j NACK/DTX, NACK/ ACK, ACK −1 DTX ACK, ACK ACK, NACK/DTX  j ACK,NACK/DTX ACK, NACK/DTX  1 NACK/DTX, ACK ACK, NACK/DTX  1 NACK/DTX, NACK/ACK, NACK/DTX  j DTX ACK, ACK NACK/DTX, ACK −1 ACK, NACK/DTX NACK/DTX,ACK  j NACK/DTX, ACK NACK/DTX, ACK −j NACK/DTX, NACK/ NACK/DTX, ACK  1DTX ACK, ACK NACK/DTX, NACK/ −1  DTX ACK, NACK/DTX NACK/DTX, NACK/ j DTXNACK/DTX, ACK NACK/DTX, NACK/ −j  DTX NACK, DTX NACK/DTX, NACK/ 1 DTXDTX, NACK NACK/DTX, NACK/ 1 DTX NACK, NACK NACK/DTX, NACK/ 1 DTX DTX,DTX NACK/DTX, NACK/ No transmission DTX

In case of SDM PCell+SDM SCell, PUCCH resources 0 and 1 can beimplicitly signaled. For example, PUCCH resources 0 and 1 can be linkedto CCEs (e.g. lowest CCE index and lowest CCE index+1) constructing a DLgrant PDCCH corresponding to a PDSCH of the PCell (refer to Equation 1).PUCCH resources 2 and 3 can be linked to CCEs (e.g. lowest CCE index andlowest CCE index+1) constructing a DL grant PDCCH corresponding to aPDSCH of the SCell (e.g. in case of cross-CC scheduling) or explicitlysignaled by RRC (e.g. in case of non-cross-CC scheduling).

To support LTE PUCCH format 1b (LTE fallback), an ACK/ACK/DTX/DTX(A/A/D/DTX) state is mapped to −1 of PUCCH resource 0 and aNACK/NACK/DTX/DTX (N/N/D/D) state is mapped to +1 of PUCCH resource 0.

Table 14 arranges the mapping table shown in Table 13 in a differentform.

TABLE 14 HARQ- HARQ- HARQ- HARQ- ACK(0) ACK(1) ACK(2) ACK(3) n⁽¹⁾_(PUCCH, i) b(0)b(1) ACK ACK ACK ACK n⁽¹⁾ _(PUCCH, 1) 1, 1 ACK NACK/DTXACK ACK n⁽¹⁾ _(PUCCH, 2) 0, 1 NACK/DTX ACK ACK ACK n⁽¹⁾ _(PUCCH, 1) 0, 1NACK/DTX NACK/DTX ACK ACK n⁽¹⁾ _(PUCCH, 3) 1, 1 ACK ACK ACK NACK/DTXn⁽¹⁾ _(PUCCH, 1) 1, 0 ACK NACK/DTX ACK NACK/DTX n⁽¹⁾ _(PUCCH, 2) 0, 0NACK/DTX ACK ACK NACK/DTX n⁽¹⁾ _(PUCCH, 1) 0, 0 NACK/DTX NACK/DTX ACKNACK/DTX n⁽¹⁾ _(PUCCH, 3) 1, 0 ACK ACK NACK/DTX ACK n⁽¹⁾ _(PUCCH, 2) 1,1 ACK NACK/DTX NACK/DTX ACK n⁽¹⁾ _(PUCCH, 2) 1, 0 NACK/DTX ACK NACK/DTXACK n⁽¹⁾ _(PUCCH, 3) 0, 1 NACK/DTX NACK/DTX NACK/DTX ACK n⁽¹⁾_(PUCCH, 3) 0, 0 ACK ACK NACK/DTX NACK/DTX n⁽¹⁾ _(PUCCH, 0) 1, 1 ACKNACK/DTX NACK/DTX NACK/DTX n⁽¹⁾ _(PUCCH, 0) 1, 0 NACK/DTX ACK NACK/DTXNACK/DTX n⁽¹⁾ _(PUCCH, 0) 0, 1 NACK DTX NACK/DTX NACK/DTX n⁽¹⁾_(PUCCH, 0) 0, 0 DTX NACK NACK/DTX NACK/DTX n⁽¹⁾ _(PUCCH, 0) 0, 0 NACKNACK NACK/DTX NACK/DTX n⁽¹⁾ _(PUCCH, 0) 0, 0 DTX DTX NACK/DTX NACK/DTXNo Transmission

In Table 14, n_(PUCCH,i) ⁽¹⁾ (1=0, 1, 2, 3) denotes PUCCH resourceindexes corresponding to PUCCH resources 0, 1, 2 and 3 of Table 13 andb(0)b(1) denotes a bit value corresponding to a complex modulation valueof Table 13 (refer to QPSK of Table 2). n_(PUCCH,i) ⁽¹⁾ (i=0, 1, 2, 3)may depend on serving cell configuration. For example, when the PCell isset to a transmission mode supporting transmission of a single TB,n_(PUCCH,0) ⁽¹⁾ can be linked to a first CCE index of a CCE constructinga PDCCH corresponding to a PDSCH of the PCell (refer to Equation 1). Inthis case, n_(PUCCH,i) ⁽¹⁾ (i=0, 1, 2, 3) can be linked to the first CCEindex (and the second CCE index) relating to a PDCCH corresponding to aPDSCH of an SCell corresponding to HARQ-ACK(1), HARQ-ACK(2) andHARQ-ACK(3) (e.g. in case of cross-CC scheduling) or explicitly providedby a higher layer (e.g. in case of non-cross-CC scheduling). When thePCell is set to a transmission mode supporting transmission of up to 2TBs, n_(PUCCH,0) ⁽¹⁾ and n_(PUCCH,1) ⁽¹⁾ can be linked to the first CCEindex and the second CCE index of CCEs constructing the PDCCHcorresponding to the PDSCH of the PCell. In this case, n_(PUCCH,2) ⁽¹⁾and n_(PUCCH,3) ⁽¹⁾ can be linked to the first CCE index (and the secondCCE index) relating to a PDCCH corresponding to a PDSCH of an SCellcorresponding to HARQ-ACK(2) and HARQ-ACK(3) (e.g. in case of cross-CCscheduling) or explicitly provided by a higher layer (e.g. in case ofnon-cross-CC scheduling).

Referring to Table 14, upon reception of one or more PDSCHs from the BS,the UE generates HARQ-ACK(0), HARQ-ACK(1), HARQ-ACK(2) and HARQ-ACK(3)corresponding to the PDSCHs. The UE select PUCCH resources (e.g.n_(PUCCH,i) ⁽¹⁾) corresponding to HARQ-ACK(0), HARQ-ACK(1), HARQ-ACK(2)and HARQ-ACK(3) and transmits a corresponding bit value (or modulationvalue) to the BS through the selected PUCCH resources.

A/N Channel Selection During SPS

An ACK/NACK (A/N) channel selection scheme during dynamic schedulingassumes that 2 dynamic A/N PUCCH resources can be derived from one PDCCHwhen a PDCCH is received in a cell set to a MIMO mode (i.e. SDM mode).Accordingly, it is possible to feed back ACK/NACK using 3-bit channelselection mapping when the PCell is set to a MIMO mode (i.e.transmission mode supporting transmission of up to m (m≥2) TBs) and theSCell is set to a non-MIMO mode (i.e. transmission mode supportingtransmission of a maximum of one TB) even if 2 DL CCs are aggregated(refer to Tables 11 and 12).

When SPS is activated, however, the UE cannot use the above-describedassumption (i.e. 2 dynamic A/N PUCCH resources are derived from onePDCCH when a PDCCH is received in a cell set to a MIMO mode) because theUE can receive a PDSCH without a PDCCH in the PCell of a specificsubframe (e.g. SPS subframe). The conventional method configures a PUCCHresource for SPS ACK/NACK transmission through a higher layer signalingand allocates only one resource as an actually used PUCCH resourcethrough the SPS activation PDCCH, as described above with reference toTable 5. The SPS release PDCCH is generally configured using one CCE,and thus only one dynamic A/N PUCCH resource can be derived when the SPSrelease PDCCH is received. Accordingly, the conventional method can useonly one PUCCH resource for SPS ACK/NACK irrespective of whether a cellcorresponds to MIMO or non-MIMO. However, the mapping tables for A/Nchannel selection, shown in Tables 11 to 14, are designed on theassumption that 2 PUCCH resources can be derived in case of a MIMO cell.Accordingly, when an SPS subframe is present in a MIMO cell, ACK/NACKfeedback for the SPS subframe generates a problem relating to PUCCHresource 1 (n_(PUCCH,1) ⁽¹⁾) of Tables 11 to 14, for example. That is,when downlink SPS is performed in a serving cell set to MIMO, PUCCHresource allocation for A/N channel selection becomes a problem.

The present invention proposes various schemes for performing A/Nchannel selection when downlink SPS is performed in a serving cell setto MIMO. For convenience, a PDSCH received according to dynamicscheduling is called a dynamic PDSCH or a normal PDSCH in order todiscriminate the dynamic PDSCH from the SPS PDSCH. While a PDCCHcorresponding to the dynamic PDSCH exists, a PDCCH corresponding to theSPS PDSCH does not exist. CRC of the PDCCH corresponding to the dynamicPDSCH can be masked with a C-RNTI.

In the following description, the SPS PDSCH may be restricted such thatit is transmitted only through a PCell. Furthermore, the SPS PDSCH maybe restricted such that it transmits a maximum of one TB irrespective ofwhether the PCell is set to MIMO/non-MIMO.

Scheme 1

Scheme 1 performs (N−1) bit A/N channel selection for ACK/NACK feedbackfor a subframe in which the SPS PDSCH is received when the UE is set toperform N bit (e.g. N=3 or 4) A/N channel selection and the SPS PDSCH isreceived through a serving cell set to the MIMO mode. Since both the BSand the UE know the subframe (i.e. SPS subframe) for the SPS PDSCH, theBS and the UE do not misrecognize a mapping table for channel selectionand an error due to the misrecognition is not generated even when thenumber of ACK/NACK bits used for A/N channel selection is dynamicallychanged in the subframe in which the SPS PDSCH is received. In thiscase, a PUCCH resource reserved for SPS ACK/NACK can be mapped to aresource for the PCell in an (N−1) bit mapping table. For example, whena mapping table for A/N channel selection is changed from a 4-bit table(e.g. Tables 13 and 14) to a 3-bit table (e.g. Tables 11 and 12), thePUCCH resource reserved for SPS ACK/NACK can be used as PUCCH resource 2(e.g. n_(PUCCH,2) ⁽¹⁾) in Tables 11 and 12.

Specifically, when the PCell is set to the MIMO mode and the SCell isset to the non-MIMO mode, the UE is set such that it performs 3-bit A/Nchannel selection (refer to Tables 11 and 12). However, when the SPSPDSCH is received in the MIMO cell (i.e. PCell), ACK/NACK feedback for aTB of the subframe (i.e. SPS subframe) in which the SPS PDSCH is presentcan be performed according to 2-bit A/N channel selection (refer toTables 9 and 10). For example, 2-bit A/N channel selection is performedusing one PUCCH resource reserved for SPS ACK/NACK transmission througha higher layer signaling (e.g. RRC signaling) and one PUCCH resourcederived from a PDCCH corresponding to an SCell PDSCH. On the contrary,ACK/NACK feedback for a TB of a subframe (non-SPS subframe) in which theSPS PDSCH is not present is performed according to 3-bit A/N channelselection. For example, 3-bit A/N channel selection can be performedusing 2 PUCCH resources derived from a PDCCH corresponding to a PCellPDSCH and one PUCCH resource derived from the PDCCH corresponding to theSCell PDSCH.

Alternatively, when the PCell is set to the MIMO mode and the SCell isset to the MIMO mode, the UE is set such that it performs 4-bit A/Nchannel selection (refer to Tables 13 and 14). However, when the SPSPDSCH is received in an MIMO cell, preferably, MIMO PCell, ACK/NACKinformation regarding a TB of the subframe in which the SPS PDSCH ispresent is fed back according to 3-bit A/N channel selection (refer toTables 11 and 12). For example, 3-bit A/N channel selection can beperformed using one PUCCH resource reserved for SPS ACK/NACKtransmission through higher layer signaling (e.g. RRC signaling) and 2PUCCH resources derived from a PDCCH corresponding to an SCell PDSCH. Onthe contrary, ACK/NACK feedback for a TB of a subframe in which the SPSPDSCH is not present can be performed according to 4-bit A/N channelselection. For example, 4-bit A/N channel selection can be performedusing 2 PUCCH resources derived from a PDCCH corresponding to a PCellPDSCH and 2 PUCCH resources derived from the PDCCH corresponding to theSCell PDSCH.

FIG. 9 illustrates an ACK/NACK feedback process according to anembodiment of the present invention.

Referring to FIG. 9, the BS and the UE can set cell configuration, SPSconfiguration and an ACK/NACK feedback scheme (S902). Informationregarding cell configuration includes the number of aggregated cells anda transmission mode of each cell, for example. Information regarding SPSconfiguration may include information (e.g. a subframe interval and asubframe offset) indicating the subframe (i.e. SPS subframe) in whichthe SPS PDSCH is transmitted and information indicating a plurality ofPUCCH resources for SPS ACK/NACK, for example. The ACK/NACK feedbackscheme includes A/N channel selection and may be explicitly signaledfrom the BS to the UE or indirectly indicated through cell configurationinformation, etc. The present ACK/NACK feedback process is performed onthe assumption that the ACK/NACK feedback scheme is set to N bit A/Nchannel selection.

The UE receives the SPS activation PDCCH from the BS (S904). The SPSactivation PDCCH (Table 3) can indicate one of a plurality of PUCCHresources allocated during an SPS configuration process. Then, the UEreceives one or more PDSCHs from the BS (S906). The one or more PDSCHscan be received through one or more of a plurality of serving cells. Theone or more PDSCHs can include at least one of the SPS PDSCH and one ormore dynamic PDSCHs.

When one or more PDSCHs are received, the UE performs A/N channelselection for ACK/NACK feedback (S908). In the present embodiment, theUE performs N-bit A/N channel selection or (N−1)-bit A/N channelselection. Specifically, when the SPS PDSCH is received in a MIMO PCell,the UE can perform (N−1)-bit A/N channel selection for ACK/NACKfeedback. In other cases (i.e. in case of a non-MIMO PCell, in a case inwhich the SPS PDSCH is not received in the MIMO PCell, etc.), the UE canperform N-bit A/N channel selection for ACK/NACK feedback. Then, the UEfeeds back ACK/NACK information through a PUCCH (S910).

When a PDCCH having a C-RNTI is detected from the SPS subframe, data(e.g. a TB) to be transmitted through the SPS PDSCH can be transmittedthrough a PDSCH indicated by the PDCCH (i.e. overriding). In this case,the UE can feed back ACK/NACK through PUCCH resource(s) inferred by thedetected PDCCH (i.e. N-bit A/N channel selection). However, when the UEfails to detect the PDCCH, the BS expects feedback of ACK/NACK throughthe PUCCH resource according to the PDCCH (i.e. N-bit A/N channelselection) and the UE transmits ACK/NACK feedback using an SPS PUCCHresource (i.e. (N−1)-bit A/N channel selection). In this case, thenumber of bits and PUCCH resources used for A/N channel selection arechanged, and thus ACK/NACK cannot be correctly fed back.

Accordingly, when N-bit A/N channel selection is set, the BS and the UEcan apply spatial bundling to ACK/NACK information for the PCell whileperforming (N−1)-bit A/N channel selection all the time in the SPSsubframe (or SPS TTI). Spatial bundling is a scheme of applying alogical-AND operation to TBs of a corresponding serving cell.Accordingly, ACK is fed back only when all responses to TBs correspondto ACK and NACK is fed back in other cases. Spatial bundling may beperformed only when a PDCCH masked with a C-RNTI is detected from theSPS subframe. According to the present scheme, even if a plurality of(e.g. 2) TBs is received through a dynamic PDSCH in the SPS subframe ofthe PCell, the UE can perform ACK/NACK feedback for the TBs in the samemanner as the UE feeds back ACK/NACK for one TB. Accordingly, ambiguitybetween the BS and the UE disappears even when an (N−1)-bit tableinstead of an N-bit table is applied for A/N channel selection.

Scheme 2

Scheme 2 performs A/N channel selection using a plurality of (e.g. 2)resources reserved by SPS when the UE is set such that it transmitsACK/NACK using A/N channel selection and the SPS PDSCH is received in aMIMO cell. According to the present scheme, a PUCCH resource shortageproblem is not generated during A/N channel selection even if the SPSPDSCH is received in the MIMO cell. Accordingly, A/N channel selectionmapping used for a non-SPS subframe can be used for the SPS subframewithout change.

FIG. 10 illustrates an ACK/NACK feedback process according to anembodiment of the present invention.

Referring to FIG. 10, the BS and the UE can set cell configuration, SPSconfiguration and an ACK/NACK feedback scheme (S1002). Informationregarding cell configuration includes the number of aggregated cells anda transmission mode of each cell, for example. Information regarding SPSconfiguration may include information (e.g. a subframe interval and asubframe offset) indicating the subframe (i.e. SPS subframe) in whichthe SPS PDSCH is transmitted and information indicating a plurality ofPUCCH resources for SPS ACK/NACK, for example. The ACK/NACK feedbackscheme includes A/N channel selection and may be explicitly signaledfrom the BS to the UE or indirectly indicated through cell configurationinformation, etc. The present ACK/NACK feedback process is performed onthe assumption that the ACK/NACK feedback scheme is set to N bit A/Nchannel selection.

The UE receives the SPS activation PDCCH from the BS (S1004). The SPSactivation PDCCH (Table 3) includes resource indication information.Then, the UE receives one or more PDSCHs from the BS (S1006). The one ormore PDSCHs can be received through one or more of a plurality ofserving cells. The one or more PDSCHs can include at least one of theSPS PDSCH and one or more dynamic PDSCHs.

When one or more PDSCHs are received, the UE performs A/N channelselection to transmit ACK/NACK feedback (S1008). In the presentembodiment, the UE performs N-bit A/N channel selection all the time,distinguished from the embodiment shown in FIG. 9. However, one PUCCHresource is derived from the resource indication information of S1004when the SPS PDSCH is received in a non-MIMO cell and a plurality of(e.g. 2) PUCCH resources are derived from the resource indicationinformation when the SPS PDSCH is received in the MIMO cell. Theresource indication information can indicate a single value. The UEfeeds back ACK/NACK information through a PUCCH (S1010).

Specifically, the following scheme can be considered as a scheme ofusing a plurality of (e.g. 2) PUCCH resources for a MIMO cell in whichthe SPS PDSCH is received when the SPS PDSCH is received in the MIMOcell, preferably MIMO PCell.

-   -   The BS can occupy/allocate a total of 4 resource pairs and use        one of the 4 PUCCH resource pairs using resource indication        information included in an SPS activation PDCCH signal. The        resource indication information may be a 2-bit value (i.e. 4        states) transmitted through the TPC field of the SPS activation        PDCCH. Detailed schemes are as follows.    -   Scheme 1: The BS can previously occupy/allocate a total of 8        PUCCH format 1a/1b resources (simply, PUCCH resources). Previous        occupation/allocation of the 8 PUCCH resources can be limited to        a case in which the UE is set to the MIMO mode or the PCell is        set to the MIMO mode and 4 PUCCH resources can be previously        occupied/allocated in other cases. Alternatively, the BS can        previously occupy/allocate a total of 8 PUCCH resources and        flexibly use the PUCCH resources according to whether a cell        (e.g. PCell) in which the SPS PDSCH is transmitted is set to the        MIMO mode or non-MIMO mode. Information about the PUCCH        resources previously occupied/allocated by the BS can be        transmitted from the BS to the UE using a higher layer (e.g.        RRC) signal. When the 8 PUCCH resources are signaled, the 8        PUCCH resources can be respectively signaled. If the 8 PUCCH        resources have a predetermined relationship (e.g. offset)        thereamong, it is possible to signal some (e.g. 4 PUCCH        resources) of the PUCCH resources and infer the remaining PUCCH        resources using the predetermined relationship (e.g. offset).        When the BS transmits the SPS activation PDCCH signal to the UE,        two of the 8 PUCCH resources can be used through the resource        indication information (e.g. a 2-bit value of the TPC field).        For example, if the BS previously occupies/allocates 8 PUCCH        resources (e.g. n₁, n₂, n₃, n₄, n₅, n₆, n₇, n₈), the resource        indication information (e.g. 2-bit value) included in the SPS        activation PDCCH can be used to indicate a PUCCH resource pair        of (n₁, n₅), (n₂, n₆), (n₃, n₇) or (n₄, n₈). Furthermore, the 8        PUCCH resources allocated by the BS (e.g. RRC layer) may be        exclusive or overlapped. Alternatively, 4 PUCCH resource pairs        (e.g. (n₁, n₅), (n₂, n₆), (n₃, n₇) and (n₄, n₈)) can be        allocated through a RRC signaling and a PUCCH resource pair to        be actually used during SPS can be indicated by the resource        indication information (e.g. 2-bit value of the TPC field) of        the SPS activation PDCCH.        -   When the PCell is set to a transmission mode (TM) supporting            transmission of a maximum of one TB (e.g. TM 1, 2, 5, 6, 7),            one of 4 PUCCH resources configured by the higher layer            (e.g. RRC) can be inferred from the resource indication            information (e.g. 2-bit value of the TPC field) of the SPS            activation PDCCH. The PUCCH resource indicated by the            resource indication information (e.g. 2-bit value of the TPC            field) can replace a PUCCH resource for the PCell in a            mapping table for A/N channel selection.        -   When the PCell is set to a transmission mode (TM) supporting            transmission of up to 2 TBs (e.g. TM 3, 4, 8, 9), one PUCCH            resource pair from among 8 PUCCH resources (which may be            identical or different) or 4 PUCCH resource pairs configured            by the higher layer (e.g. RRC) can be inferred from the            resource indication information (e.g. 2-bit value of the TPC            field) of the SPS activation PDCCH. The PUCCH resource pair            inferred by the resource indication information can replace            2 PUCCH resources for the PCell in a mapping table for A/N            channel selection.    -   Scheme 2: The BS can pre-allocate a total of 4 PUCCH format        1a/1b resources (simply, PUCCH resources) to the UE through        higher layer (e.g. RRC) signaling. The 4 PUCCH resources        allocated by RRC may be exclusive or overlapped. 2 PUCCH        resources actually used during SPS can be inferred using the        resource indication information (e.g. 2-bit value of the TPC        field) of the SPS activation PDCCH signal. For example, if the        UE is allocated 4 PUCCH resources (e.g. n₁, n₂, n₃, n₄), the        resource indication information (e.g. 2-bit value) of the SPS        activation PDCCH can indicate a PUCCH resource pair of (n₁, n₂),        (n₂, n₃), (n₃, n₄) or (n₄, n₁). Alternatively, the resource        indication information (e.g. 2-bit value) of the SPS activation        PDCCH can indicate a PUCCH resource pair of (n₁, n₃), (n₁, n₄),        (n₂, n₃) or (n₃, n₄). When 4 PUCCH resource pairs each of which        is composed of 2 PUCCH resources, such as (n₁, n₂), (n₂, n₃),        (n₃, n₄) and (n₄, n₁), are configured by RRC, resources in each        PUCCH resource pair can be sequentially mapped to PUCCH        resources for the PCell in a mapping table for A/N channel        selection. For example, if (n₂, n₃) is indicated by the TPC        field of the SPS activation PDCCH in ACK/NACK feedback (e.g.        Tables 13 and 14) using 4-bit A/N channel selection, resources        n₂ and n₃ can be respectively mapped to PUCCH resources 0 and 1        in the mapping table. The present scheme can be applied only        when the UE, preferably, PCell is set to the MIMO mode.

Scheme 3

Scheme 3 uses a PUCCH resource (simply SPS PUCCH) (refer to Table 5 anddescription thereof) reserved for SPS as the first PUCCH resource(corresponding to PUCCH resource 0 in Tables 11 and 13) of the PCell anduses an explicit PUCCH resource separately allocated through a higherlayer (e.g. RRC) signaling as the second PUCCH resource (correspondingto PUCCH resource 1 in Tables 11 and 13) of the PCell in the A/N channelselection scheme when the SPS PDSCH is received in the MIMO PCell. Forexample, one of a plurality of (e.g. 4) resources allocated through aRRC signaling can be selected as the second PUCCH resource of the PCell.In this case, the second PUCCH resource of the PCell can be determinedusing an ARI (e.g. the value of the TPC field) signaled through a PDCCHthat schedules an SCell PDSCH when the SPS PDSCH is received in the MIMOPCell (refer to Table 7).

When the PCell is set to the MIMO mode and a PDSCH is received in anon-SPS subframe, the first and second PUCCH resources (corresponding toPUCCH resources 0 and 1 in Tables 11 and 13, for example) for the PCellcan be linked to CCEs (e.g. lowest CCE index and lowest CCE index+1)constructing a DL grant PDCCH corresponding to a PDSCH of the PCell(that is, implicit PUCCH resource allocation) (refer to Equation 1).

Specifically, when both the PCell and SCell are set to the MIMO mode and4-bit A/N channel selection is performed (refer to Tables 13 and 14),the following resource allocation scheme can be considered according towhether cross-CC scheduling is enabled or disabled and whether the SPSsubframe is present. Resource allocation when the PCell is set to theMIMO mode and the SCell is set to the non-MIMO mode and 3-bit A/Nchannel selection is performed (refer to Tables 11 and 12) can beapplied by excluding the part regarding the second resource of the SCellfrom the following.

1) When cross-CC scheduling is enabled

-   -   A. In case of non-SPS subframe        -   i. PCell 1^(st) resource: implicit PUCCH resource linked to            n_(CCE) of a PDCCH that schedules the PCell        -   ii. PCell 2^(nd) resource: implicit PUCCH resource linked to            n_(CCE)+1 of the PDCCH that schedules the PCell        -   iii. SCell 1^(st) resource: implicit PUCCH resource linked            to n_(CCE) of a PDCCH that schedules the SCell        -   iv. SCell 2^(nd) resource: implicit PUCCH resource linked to            n_(CCE)+1 of the PDCCH that schedules the SCell    -   B. In case of SPS subframe        -   i. PCell 1^(st) resource: SPS PUCCH resource        -   ii. PCell 2^(nd) resource: explicit PUCCH resource        -   iii. SCell 1^(st) resource: implicit PUCCH resource linked            to n_(CCE) of the PDCCH that schedules the SCell        -   iv. SCell 2^(nd) resource: implicit PUCCH resource linked to            n_(CCE)+1 of the PDCCH that schedules the SCell        -   v. An explicit PUCCH is determined using the TPC field of            the PDCCH that schedules the SCell as an ARI. For example,            the ARI indicates one of 4 resources pre-allocated through            RRC.

2) When cross-CC scheduling is disabled

-   -   A. In case of non-SPS subframe        -   i. PCell 1^(st) resource: implicit PUCCH resource linked to            n_(CCE) of the PDCCH that schedules the PCell        -   ii. PCell 2^(nd) resource: implicit PUCCH resource linked to            n_(CCE)+1 of the PDCCH that schedules the PCell        -   iii. SCell 1^(st) resource: explicit PUCCH resource #1        -   iv. SCell 2^(nd) resource: explicit PUCCH resource #2        -   v. Explicit PUCCH resources #1 and #2 are determined using            the TPC field of the SCell scheduling PDCCH as an ARI. For            example, the ARI indicates two of 8 resources pre-allocated            through RRC.    -   B. In case of SPS subframe        -   i. PCell 1^(st) resource: SPS PUCCH resource        -   ii. PCell 2^(nd) resource: explicit PUCCH resource #3        -   iii. SCell 1^(st) resource: explicit PUCCH resource #1        -   iv. SCell 2^(nd) resource: explicit PUCCH resource #2        -   v. Explicit PUCCH resources #1, #2 and #3 are determined            using the TPC field of the SCell scheduling PDCCH as an ARI.            For example, the ARI indicates three of 12 resources            pre-allocated through RRC.

FIG. 11 illustrates a BS and a UE applicable to an embodiment of thepresent invention. When a wireless communication system includes arelay, communication is performed between a BS and the relay on abackhaul link and between the relay and a UE on an access link. The BSor UE shown in FIG. 16 can be replaced by a relay as necessary.

Referring to FIG. 11, an RF communication system includes a BS 110 and aUE 120. The BS 110 includes a processor 112, a memory 114 and an RF unit116. The processor 112 may be configured to implement the proceduresand/or methods proposed by the present invention. The memory 114 isconnected to the processor 112 and stores various types of informationrelating to operations of the processor 112. The RF unit 116 isconnected to the processor 112 and transmits and/or receives RF signals.The UE 120 includes a processor 122, a memory 124 and an RF unit 126.The processor 122 may be configured to implement the procedures and/ormethods proposed by the present invention. The memory 124 is connectedto the processor 122 and stores various types of information relating tooperations of the processor 122. The RF unit 126 is connected to theprocessor 122 and transmits and/or receives RF signals. The BS 110 andthe UE 120 may have a single antenna or multiple antennas.

The embodiments of the present invention described hereinbelow arecombinations of elements and features of the present invention. Theelements or features may be considered selective unless otherwisementioned. Each element or feature may be practiced without beingcombined with other elements or features. Further, an embodiment of thepresent invention may be constructed by combining parts of the elementsand/or features. Operation orders described in embodiments of thepresent invention may be rearranged. Some constructions of any oneembodiment may be included in another embodiment and may be replacedwith corresponding constructions of another embodiment. It is obvious tothose skilled in the art that claims that are not explicitly cited ineach other in the appended claims may be presented in combination as anembodiment of the present invention or included as a new claim by asubsequent amendment after the application is filed.

In the embodiments of the present invention, a description is made,centering on a data transmission and reception relationship between a BSand a UE. In some cases, a specific operation described as performed bythe BS may be performed by an upper node of the BS. Namely, it isapparent that, in a network comprised of a plurality of network nodesincluding a BS, various operations performed for communication with anMS may be performed by the BS, or network nodes other than the BS. Theterm ‘eNB’ may be replaced with the term ‘fixed station’, ‘Node B’,‘Base Station (BS)’, ‘access point’, etc. The term ‘UE’ may be replacedwith the term ‘Mobile Station (MS)’, ‘Mobile Subscriber Station (MSS)’,‘mobile terminal’, etc.

The embodiments of the present invention may be achieved by variousmeans, for example, hardware, firmware, software, or a combinationthereof. In a hardware configuration, the methods according to theembodiments of the present invention may be achieved by one or moreApplication Specific Integrated Circuits (ASICs), Digital SignalProcessors (DSPs), Digital Signal Processing Devices (DSPDs),Programmable Logic Devices (PLDs), Field Programmable Gate Arrays(FPGAs), processors, controllers, microcontrollers, microprocessors,etc.

In a firmware or software configuration, the embodiments of the presentinvention may be implemented in the form of a module, a procedure, afunction, etc. For example, software code may be stored in a memory unitand executed by a processor. The memory unit is located at the interioror exterior of the processor and may transmit and receive data to andfrom the processor via various known means.

Those skilled in the art will appreciate that the present invention maybe carried out in other specific ways than those set forth hereinwithout departing from the spirit and essential characteristics of thepresent invention. The above embodiments are therefore to be construedin all aspects as illustrative and not restrictive. The scope of theinvention should be determined by the appended claims and their legalequivalents, not by the above description, and all changes coming withinthe meaning and equivalency range of the appended claims are intended tobe embraced therein.

INDUSTRIAL APPLICABILITY

The present invention is applicable to wireless communicationapparatuses such as a UE, a relay, a BS, etc.

The invention claimed is:
 1. A method for transmitting uplink controlinformation by a user equipment (UE) configured with a primary cell anda secondary cell in a wireless communication system, the methodcomprising: receiving, by the UE, Physical Uplink Control Channel(PUCCH) resource indication information through an Semi-PersistentScheduling (SPS) activation Physical Downlink Control Channel (PDCCH);receiving, by the UE, an SPS Physical Downlink Shared Channel (PDSCH)via the primary cell without after receiving the SPS PDCCH; andtransmitting, by the UE, a first bit and a second bit using a PUCCHresource selected from a plurality of PUCCH resources in accordance witha set of Hybrid Automatic Repeat reQuest-Acknowledgements (HARQ-ACKs),the set of HARQ-ACKs including first HARQ-ACK information for the SPSPDSCH, wherein: when the primary cell is set to a first transmissionmode supporting a transmission of up to one transport block, theplurality of PUCCH resources includes a single PUCCH resource indicatedby using the SPS activation PDCCH, and when the primary cell is set to asecond transmission mode supporting a transmission of up to twotransport blocks, the plurality of PUCCH resources includes two PUCCHresources indicated by using the SPS activation PDCCH, and wherein theSPS PDSCH carries only one transport block regardless of whether theprimary cell is set to any of the first transmission mode or the secondtransmission mode.
 2. The method of claim 1, wherein the plurality ofPUCCH resources includes a first PUCCH resource indicated by the SPSactivation PDCCH and a second PUCCH resource related to the first PUCCHresource indicated by the SPS PDCCH when the primary cell is set to thesecond transmission mode.
 3. The method of claim 1, wherein the PUCCHresource indication information indicates one or more PUCCH resourcesreserved by a network.
 4. The method of claim 1, wherein the pluralityof PUCCH resources are PUCCH format 1b resources.
 5. The method of claim1, wherein the PUCCH resource indication information indicating the atleast one PUCCH resource indicates a single value, and wherein a singlePUCCH resource based on the single value is used to transmit the firstand second bits when the primary cell is set to the first transmissionmode, and a pair of PUCCH resources based on the single value is used totransmit the first and second bits when the primary cell is set to thesecond transmission mode.
 6. The method of claim 1, wherein the set ofHARQ-ACKs includes first HARQ-ACK information for the SPS PDSCH andsecond HARQ-ACK information for a PDSCH received via the secondary cell.7. The method of claim 6, wherein a relationship among the set ofHARQ-ACKs, the plurality of PUCCH resources, and the first and secondbits includes the relationship shown in Table 1: TABLE 1 HARQ- HARQ-HARQ- ACK(0) ACK(1) ACK(2) n⁽¹⁾ _(PUCCH, i) b(0)b(1) ACK ACK ACK n⁽¹⁾_(PUCCH, 1) 1, 1 ACK NACK/DTX ACK n⁽¹⁾ _(PUCCH, 1) 1, 0 NACK/DTX ACK ACKn⁽¹⁾ _(PUCCH, 1) 0, 1 NACK/DTX NACK/DTX ACK n⁽¹⁾ _(PUCCH, 2) 1, 1 ACKACK NACK/DTX n⁽¹⁾ _(PUCCH, 0) 1, 1 ACK NACK/DTX NACK/DTX n⁽¹⁾_(PUCCH, 0) 1, 0 NACK/DTX ACK NACK/DTX n⁽¹⁾ _(PUCCH, 0) 0, 1 NACK/DTXNACK/DTX NACK n⁽¹⁾ _(PUCCH, 2) 0, 0 NACK NACK/DTX DTX n⁽¹⁾ _(PUCCH, 0)0, 0 NACK/DTX NACK DTX n⁽¹⁾ _(PUCCH, 0) 0, 0 DTX DTX DTX No Transmission

wherein HARQ-ACK(0), HARQ-ACK(1) and HARQ-ACK(2) represent the HARQ-ACKresponse corresponding to the PDSCH received via the secondary cell andthe HARQ-ACK response corresponding to the SPS PDSCH received via theprimary cell, n_(PUCCH,i) ⁽¹⁾ (i=0, 1, 2) denotes the plurality of PUCCHresources, and b(0)b(1) denotes the first and second bits, wherein, whenthe primary cell is set to the first transmission mode, n_(PUCCH,i) ⁽¹⁾(i=2) is the single PUCCH resource indicated by using the PUCCH resourceindication information received via the SPS activation PDCCH, andwherein, when the primary cell is set to the second transmission mode,n_(PUCCH,i) ⁽¹⁾ (i=0, 1) is the two PUCCH resources indicated by usingthe PUCCH resource indication information received via the SPSactivation PDCCH.
 8. The method of claim 6, wherein a relationship amongthe set of HARQ-ACKs, the plurality of PUCCH resources, and the firstand second bits includes the relationship shown in Table 2: TABLE 2HARQ- HARQ- HARQ- HARQ- ACK(0) ACK(1) ACK(2) ACK(3) n⁽¹⁾ _(PUCCH, i)b(0)b(1) ACK ACK ACK ACK n⁽¹⁾ _(PUCCH, 1) 1, 1 ACK NACK/DTX ACK ACK n⁽¹⁾_(PUCCH, 2) 0, 1 NACK/DTX ACK ACK ACK n⁽¹⁾ _(PUCCH, 1) 0, 1 NACK/DTXNACK/DTX ACK ACK n⁽¹⁾ _(PUCCH, 3) 1, 1 ACK ACK ACK NACK/DTX n⁽¹⁾_(PUCCH, 1) 1, 0 ACK NACK/DTX ACK NACK/DTX n⁽¹⁾ _(PUCCH, 2) 0, 0NACK/DTX ACK ACK NACK/DTX n⁽¹⁾ _(PUCCH, 1) 0, 0 NACK/DTX NACK/DTX ACKNACK/DTX n⁽¹⁾ _(PUCCH, 3) 1, 0 ACK ACK NACK/DTX ACK n⁽¹⁾ _(PUCCH, 2) 1,1 ACK NACK/DTX NACK/DTX ACK n⁽¹⁾ _(PUCCH, 2) 1, 0 NACK/DTX ACK NACK/DTXACK n⁽¹⁾ _(PUCCH, 3) 0, 1 NACK/DTX NACK/DTX NACK/DTX ACK n⁽¹⁾_(PUCCH, 3) 0, 0 ACK ACK NACK/DTX NACK/DTX n⁽¹⁾ _(PUCCH, 0) 1, 1 ACKNACK/DTX NACK/DTX NACK/DTX n⁽¹⁾ _(PUCCH, 0) 1, 0 NACK/DTX ACK NACK/DTXNACK/DTX n⁽¹⁾ _(PUCCH, 0) 0, 1 NACK/DTX NACK NACK/DTX NACK/DTX n⁽¹⁾_(PUCCH, 0) 0, 0 NACK NACK/DTX NACK/DTX NACK/DTX n⁽¹⁾ _(PUCCH, 0) 0, 0DTX DTX NACK/DTX NACK/DTX No Transmission

wherein HARQ-ACK(0), HARQ-ACK(1), HARQ-ACK(2) and HARQ-ACK(3) representthe HARQ-ACK response corresponding to the PDSCH received via thesecondary cell and the HARQ-ACK response corresponding to the SPS PDSCHreceived via the primary cell, n_(PUCCH,i) ⁽¹⁾ (i=0, 1, 2, 3) denotesthe plurality of PUCCH resources, and b(0)b(1) denotes the first andsecond bits, and wherein, when the primary cell is set to the secondtransmission mode, n_(PUCCH,i) ⁽¹⁾ (i=0, 1) is the two PUCCH resourcesindicated by using the PUCCH resource indication information receivedvia the SPS activation PDCCH.
 9. The method of claim 8, whereinn_(PUCCH,i) ⁽¹⁾ (i=2, 3) is provided in associated with the PDSCHreceived via the secondary cell.
 10. The method of claim 1, wherein thePUCCH resource indication information is received through a TPC(Transmit Power Control) field of the SPS activation PDCCH.
 11. A userequipment (UE) configured to transmit uplink control information in awireless communication system, the UE configured with a primary cell anda secondary cell and comprising: a transceiver; and a processoroperatively connected to the transceiver and configured to: receivePhysical Uplink Control Channel (PUCCH) resource indication informationthrough an Semi-Persistent Scheduling (SPS) activation Physical DownlinkControl Channel (PDCCH); receive an SPS Physical Downlink Shared Channel(PDSCH) via the primary cell after receiving the SPS PDCCH; and transmita first bit and a second bit using a PUCCH resource selected from aplurality of PUCCH resources in accordance with a set of HybridAutomatic Repeat reQuest-Acknowledgements (HARQ-ACKs), the set ofHARQ-ACKs including first HARQ-ACK information for the SPS PDSCH,wherein: when the primary cell is set to a first transmission modesupporting a transmission of up to one transport block, the plurality ofPUCCH resources includes a single PUCCH resource indicated by using theSPS activation PDCCH, and when the primary cell is set to a secondtransmission mode supporting a transmission of up to two transportblocks, the plurality of PUCCH resources includes two PUCCH resourcesindicated by using the SPS activation PDCCH, and wherein the SPS PDSCHcarries only one transport block regardless of whether the primary cellis set to any of the first transmission mode or the second transmissionmode.
 12. The UE of claim 11, wherein the plurality of PUCCH resourcesincludes a first PUCCH resource indicated by the SPS activation PDCCHand a second PUCCH resource related to the first PUCCH resourceindicated by the SPS PDCCH when the primary cell is set to the secondtransmission mode.
 13. The UE of claim 11, wherein the PUCCH resourceindication information indicates one or more PUCCH resources reserved bya network.
 14. The UE of claim 11, wherein the plurality of PUCCHresources are PUCCH format 1b resources.
 15. The UE of claim 11, whereinthe PUCCH resource indication information indicating the at least onePUCCH resource indicates a single value, and wherein a single PUCCHresource based on the single value is used to transmit the first andsecond bits when the primary cell is set to the first transmission mode,and a pair of PUCCH resources based on the single value is used totransmit the first and second bits when the primary cell is set to thesecond transmission mode.
 16. The UE of claim 11, wherein the set ofHARQ-ACKs includes first HARQ-ACK information for the SPS PDSCH andsecond HARQ-ACK information for a PDSCH received via the secondary cell.17. The UE of claim 16, wherein a relationship among the set ofHARQ-ACKs, the plurality of PUCCH resources, and the first and secondbits includes the relationship shown in Table 1: TABLE 1 HARQ- HARQ-HARQ- ACK(0) ACK(1) ACK(2) n⁽¹⁾ _(PUCCH, i) b(0)b(1) ACK ACK ACK n⁽¹⁾_(PUCCH, 1) 1, 1 ACK NACK/DTX ACK n⁽¹⁾ _(PUCCH, 1) 1, 0 NACK/DTX ACK ACKn⁽¹⁾ _(PUCCH, 1) 0, 1 NACK/DTX NACK/DTX ACK n⁽¹⁾ _(PUCCH, 2) 1, 1 ACKACK NACK/DTX n⁽¹⁾ _(PUCCH, 0) 1, 1 ACK NACK/DTX NACK/DTX n⁽¹⁾_(PUCCH, 0) 1, 0 NACK/DTX ACK NACK/DTX n⁽¹⁾ _(PUCCH, 0) 0, 1 NACK/DTXNACK/DTX NACK n⁽¹⁾ _(PUCCH, 2) 0, 0 NACK NACK/DTX DTX n⁽¹⁾ _(PUCCH, 0)0, 0 NACK/DTX NACK DTX n⁽¹⁾ _(PUCCH, 0) 0, 0 DTX DTX DTX No Transmission

wherein HARQ-ACK(0), HARQ-ACK(1) and HARQ-ACK(2) represent the HARQ-ACKresponse corresponding to the PDSCH received via the secondary cell andthe HARQ-ACK response corresponding to the SPS PDSCH received via theprimary cell, n_(PUCCH,i) ⁽¹⁾ (i=0, 1, 2) denotes the plurality of PUCCHresources, and b(0)b(1) denotes the first and second bits, wherein, whenthe primary cell is set to the first transmission mode, n_(PUCCH,i) ⁽¹⁾(i=2) is the single PUCCH resource indicated by using the PUCCH resourceindication information received via the SPS activation PDCCH, andwherein, when the primary cell is set to the second transmission mode,n_(PUCCH,i) ⁽¹⁾ (i=0, 1) is the two PUCCH resources indicated by usingthe PUCCH resource indication information received via the SPSactivation PDCCH.
 18. The UE of claim 16, wherein a relationship amongthe set of HARQ-ACKs, the plurality of PUCCH resources, and the firstand second bits includes the relationship shown in Table 2: TABLE 2HARQ- HARQ- HARQ- HARQ- ACK(0) ACK(1) ACK(2) ACK(3) n⁽¹⁾ _(PUCCH, i)b(0)b(1) ACK ACK ACK ACK n⁽¹⁾ _(PUCCH, 1) 1, 1 ACK NACK/DTX ACK ACK n⁽¹⁾_(PUCCH, 2) 0, 1 NACK/DTX ACK ACK ACK n⁽¹⁾ _(PUCCH, 1) 0, 1 NACK/DTXNACK/DTX ACK ACK n⁽¹⁾ _(PUCCH, 3) 1, 1 ACK ACK ACK NACK/DTX n⁽¹⁾_(PUCCH, 1) 1, 0 ACK NACK/DTX ACK NACK/DTX n⁽¹⁾ _(PUCCH, 2) 0, 0NACK/DTX ACK ACK NACK/DTX n⁽¹⁾ _(PUCCH, 1) 0, 0 NACK/DTX NACK/DTX ACKNACK/DTX n⁽¹⁾ _(PUCCH, 3) 1, 0 ACK ACK NACK/DTX ACK n⁽¹⁾ _(PUCCH, 2) 1,1 ACK NACK/DTX NACK/DTX ACK n⁽¹⁾ _(PUCCH, 2) 1, 0 NACK/DTX ACK NACK/DTXACK n⁽¹⁾ _(PUCCH, 3) 0, 1 NACK/DTX NACK/DTX NACK/DTX ACK n⁽¹⁾_(PUCCH, 3) 0, 0 ACK ACK NACK/DTX NACK/DTX n⁽¹⁾ _(PUCCH, 0) 1, 1 ACKNACK/DTX NACK/DTX NACK/DTX n⁽¹⁾ _(PUCCH, 0) 1, 0 NACK/DTX ACK NACK/DTXNACK/DTX n⁽¹⁾ _(PUCCH, 0) 0, 1 NACK/DTX NACK NACK/DTX NACK/DTX n⁽¹⁾_(PUCCH, 0) 0, 0 NACK NACK/DTX NACK/DTX NACK/DTX n⁽¹⁾ _(PUCCH, 0) 0, 0DTX DTX NACK/DTX NACK/DTX No Transmission

wherein HARQ-ACK(0), HARQ-ACK(1), HARQ-ACK(2) and HARQ-ACK(3) representthe HARQ-ACK response corresponding to the PDSCH received via thesecondary cell and the HARQ-ACK response corresponding to the SPS PDSCHreceived via the primary cell, n_(PUCCH,i) ⁽¹⁾ (i=0, 1, 2, 3) denotesthe plurality of PUCCH resources, and b(0)b(1) denotes the first andsecond bits, and wherein, when the primary cell is set to the secondtransmission mode, n_(PUCCH,i) ⁽¹⁾ (i=0, 1) is the two PUCCH resourcesindicated by using the PUCCH resource indication information receivedvia the SPS activation PDCCH.
 19. The UE of claim 18, whereinn_(PUCCH,i) ⁽¹⁾ (i=2, 3) is provided in associated with the PDSCHreceived via the secondary cell.
 20. The UE of claim 11, wherein thePUCCH resource indication information is received through a TPC(Transmit Power Control) field of the SPS activation PDCCH.